US8840109B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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Publication number
US8840109B2
US8840109B2 US14/061,909 US201314061909A US8840109B2 US 8840109 B2 US8840109 B2 US 8840109B2 US 201314061909 A US201314061909 A US 201314061909A US 8840109 B2 US8840109 B2 US 8840109B2
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Prior art keywords
gear
unit
image forming
forming apparatus
frame unit
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US14/061,909
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US20140117613A1 (en
Inventor
Osamu Sato
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Oki Electric Industry Co Ltd
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Oki Data Corp
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Assigned to OKI DATA CORPORATION reassignment OKI DATA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SATO, OSAMU
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Assigned to OKI ELECTRIC INDUSTRY CO., LTD. reassignment OKI ELECTRIC INDUSTRY CO., LTD. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: OKI DATA CORPORATION
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/44—Simultaneously, alternately, or selectively separating articles from two or more piles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/06—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers
    • B65H5/062—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers between rollers or balls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2402/00—Constructional details of the handling apparatus
    • B65H2402/30—Supports; Subassemblies; Mountings thereof
    • B65H2402/31—Pivoting support means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2402/00—Constructional details of the handling apparatus
    • B65H2402/60—Coupling, adapter or locking means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2403/00—Power transmission; Driving means
    • B65H2403/40—Toothed gearings
    • B65H2403/42—Spur gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2403/00—Power transmission; Driving means
    • B65H2403/70—Clutches; Couplings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/14—Roller pairs
    • B65H2404/144—Roller pairs with relative movement of the rollers to / from each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/60—Other elements in face contact with handled material
    • B65H2404/61—Longitudinally-extending strips, tubes, plates, or wires
    • B65H2404/611—Longitudinally-extending strips, tubes, plates, or wires arranged to form a channel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/06—Office-type machines, e.g. photocopiers

Definitions

  • the present invention relates to an image forming apparatus configured to feed a medium (for example, a recording medium or a reading medium) and form an image.
  • a medium for example, a recording medium or a reading medium
  • the present invention relates to the image forming apparatus having a configuration facilitating removal of a jammed medium.
  • a general image forming apparatus is configured to feed a medium using a pair of feeding rollers nipping the medium therebetween.
  • Japanese Laid-open Publication No. H08-72344 discloses an image forming apparatus having a configuration for preventing separation of gears of the feeding rollers when feeding a thick medium or a plurality of stacked media.
  • the medium may be jammed.
  • the medium is damaged (for example, torn)
  • the medium may be caught between guide members of a medium feeding path and may be cut into fine pieces.
  • the image forming apparatus may be configured to be divisible into two units at the medium feeding path.
  • gears of the feeding rollers mounted to the respective units
  • the gears of the feeding rollers may be damaged.
  • An aspect of the present invention is intended to provide an image forming apparatus capable of facilitating removal of a jammed medium and preventing damage to gears.
  • an image forming apparatus including a first unit including a first feeding member for feeding a medium, a second unit including a second feeding member for feeding the medium, and a medium feeding path provided between the first unit and the second unit.
  • the second unit is movable between a closing position where the medium feeding path is formed between the first unit and the second unit and an opening position where the second unit separates from the first unit so as to open the medium feeding path.
  • the first feeding member has a first gear.
  • the second feeding member has a second gear that meshes with the first gear when the second unit is in the closing position.
  • the image forming apparatus further comprises a shift mechanism. When the second unit moves to the closing position, the shift mechanism holds one of the first gear and the second gear at a retracted position where the first gear and the second gear do not mesh with each other.
  • a jammed medium can be easily removed from the image forming apparatus, and damage to the first and second gears can be prevented.
  • FIG. 1 is a perspective view showing an external shape of an image forming apparatus according to the first embodiment of the present invention
  • FIG. 2 is a perspective view showing the image forming apparatus according to the first embodiment from which an upper cover, a side cover, a lower cover and a stage are removed;
  • FIG. 3 is an enlarged perspective view showing a main part of the image forming apparatus according to the first embodiment
  • FIG. 4 is a perspective view showing the image forming apparatus according to the first embodiment in a state where an upper frame unit is opened;
  • FIG. 5A is a side view showing the upper frame unit of the image forming apparatus according to the first embodiment
  • FIG. 5B is a side view showing the upper frame unit of the image forming apparatus according to the first embodiment as seen in the opposite direction to FIG. 5A ;
  • FIG. 6 is a schematic view showing a tilt lever according to the first embodiment in a state where the upper frame unit is in a closing position
  • FIG. 7 is a schematic view showing the tilt lever according to the first embodiment in a state where the tilt lever is rotated in a no/mal direction from the state shown in FIG. 6 ;
  • FIG. 8 is a schematic view showing the tilt lever according to the first embodiment in a state where the upper frame unit is rotated to an opening position from the state shown in FIG. 7 ;
  • FIG. 9 is a schematic view showing the tilt lever according to the first embodiment in a state where the tilt lever is rotated in the normal direction from the state shown in FIG. 8 ;
  • FIG. 10 is an exploded perspective view showing a mounting structure of gears of feeding rollers of the image forming apparatus according to the first embodiment
  • FIG. 11 is a perspective view showing the mounting structure of the gears of the feeding rollers of the image forming apparatus according to the first embodiment
  • FIG. 12 is a perspective view showing a cam member of the image forming apparatus according to the first embodiment
  • FIG. 13A is a front view showing the cam member of the image forming apparatus according to the first embodiment
  • FIG. 13B is a schematic view showing a cam profile of the can member shown in FIG. 13A ;
  • FIGS. 14A and 14B are a perspective view and a plan view showing a relationship among a gear of a rear upper roller, a gear of a rear lower roller and the cam member of the image forming apparatus according to the first embodiment;
  • FIGS. 15A and 15B are a perspective view and a plan view showing a state where the cam member is rotated in the normal direction from the state shown in FIGS. 14A and 14B ;
  • FIGS. 16A , 16 B and 16 C are a perspective view, a plan view and a front view showing a state where the cam member is rotated in the normal direction from the state shown in FIGS. 15A and 15B ;
  • FIG. 17 is an enlarged perspective view showing a main part of an image forming apparatus according to the second embodiment of the present invention.
  • FIG. 18 is a perspective view showing the image forming apparatus according to the second embodiment in a state where an upper frame unit is opened;
  • FIG. 19 is a perspective view showing a cam member of the image forming apparatus according to the second embodiment.
  • FIG. 20A is a front view showing the cam member of the image forming apparatus according to the second embodiment
  • FIG. 20B is a schematic view showing a cam profile of the cam member shown in FIG. 20A ;
  • FIG. 21A is a side view showing the upper frame unit of the image forming apparatus according to the second embodiment.
  • FIG. 21B is a side view showing the upper frame unit of the image forming apparatus according to the second embodiment as seen in the opposite direction to FIG. 21A ;
  • FIGS. 22A and 22B are a perspective view and a plan view showing a relationship among a gear of a rear upper roller, a gear of a rear lower roller and the cam member of the image forming apparatus according to the second embodiment;
  • FIGS. 23A and 23B are a perspective view and a plan view showing a state where the cam member is rotated in the normal direction from the state shown in FIGS. 22A and 22B ;
  • FIGS. 24A , 24 B and 24 C are a perspective view, a plan view and a front view showing a state where the cam member is rotated in the normal direction from the state shown in FIGS. 23A and 23B .
  • FIG. 1 is a perspective view showing an external shape of an image forming apparatus according to the first embodiment of the present invention.
  • the image forming apparatus 100 has a main body cover including an upper cover 1 , side covers 2 and 3 , and a lower cover 4 .
  • the image forming apparatus 100 has an elongated shape.
  • a longitudinal direction of the image forming apparatus 100 is referred to as X direction
  • a widthwise direction of the image forming apparatus 100 is referred to as Y direction.
  • An XY plane (parallel to the X direction and the Y direction) is a horizontal plane.
  • a direction perpendicular to the XY plane is referred to as Z direction (i.e., a vertical direction).
  • the X, Y and Z directions are provided for convenience of explanation, and do not limit an orientation of the image forming apparatus 100 .
  • a medium insertion opening 6 is provided on a front surface (i.e., a surface facing +Y direction) of the upper cover 1 .
  • the medium insertion opening 6 is provided for inserting a medium (for example, a printing medium) 7 into the image forming apparatus 100 .
  • a stage 5 is provided on the lower cover 4 .
  • the stage 5 functions as a guide member for guiding the medium 7 inserted through the medium insertion opening 6 .
  • FIG. 2 is a perspective view showing the image forming apparatus 100 from which the upper cover 1 , the side cover 2 and 3 , the lower cover 4 and the stage 5 are removed.
  • FIG. 3 is an enlarged perspective view showing a main part of the image forming apparatus 100 .
  • the image forming apparatus 100 includes a lower frame unit 8 as a first unit, and an upper frame unit 9 as a second unit.
  • the upper frame unit 9 is mounted to the lower frame unit 8 so as to be rotatable about a rotation axis A extending in the X direction.
  • a medium feeding path F for feeding the medium 7 is formed between the lower frame unit 8 and the upper frame unit 9 .
  • a feeding mechanism i.e., a feeding driving unit 17 described later
  • the feeding driving unit 17 ( FIG. 3 ) is configured to feed the medium 7 along the medium feeding path F.
  • a carriage unit 11 ( FIG. 4 ) is mounted on the upper frame unit 9 .
  • the carriage unit 11 (i.e., a carriage) includes a print head 10 (i.e., a head unit) that forms an image on the medium 7 fed along the medium feeding path 9 .
  • the image forming apparatus includes two upper and lower units, i.e., the upper frame unit 9 and the lower frame unit 8 .
  • FIG. 4 is a perspective view showing the image forming apparatus 100 in a state where the upper frame unit 9 is in an upward position (i.e., an opening position).
  • a front upper roller 12 and a front lower roller 13 are mounted to the lower frame unit 8 .
  • the front lower roller 13 (not shown in FIG. 4 ) is disposed on a lower side (i.e., ⁇ Z side) of the front upper roller 12 .
  • the front upper roller 12 and the front lower roller 13 constitute front rollers (or a front roller pair).
  • the front upper roller 12 has a plurality of roller parts arranged on a common rotation shaft extending in the X direction.
  • the front lower roller 13 has a plurality of roller parts arranged on a common rotation shaft extending in the X direction.
  • the front upper roller 12 rotates in an opposite direction to the front lower roller 13 .
  • a circumferential surface of the front upper roller 12 moves in the same direction as a circumferential surface of the front lower roller 13 .
  • a rear lower roller 15 (i.e., a first feeding member) is mounted to the lower frame unit 8 and is disposed on ⁇ Y side of the front rollers 12 and 13 .
  • a rear upper roller 14 (i.e., a second feeding member) is mounted to the upper frame unit 9 and is disposed on an upper side (i.e., +Z side) of the rear lower roller 15 .
  • the rear lower roller 15 and the rear upper roller 14 constitute rear rollers (i.e., a rear roller pair).
  • the rear upper roller 14 has a plurality of roller parts arranged along a common rotation shaft extending in the X direction.
  • the rear lower roller 15 has a plurality of roller parts arranged along a common rotation shaft extending in the X direction.
  • the rear upper roller 14 rotates in an opposite direction to the rear lower roller 15 .
  • a circumferential surface of the rear upper roller 14 moves in the same direction as a circumferential surface of the rear lower roller 15 .
  • gears 16 a , 16 b , 16 c and 16 d are fixed to ends (on ⁇ X side) of the respective rotation shafts of the front rollers 12 and 13 and the rear rollers 14 and 15 .
  • the gear 16 c is not shown in FIG. 3 , but is shown in FIG. 4 .
  • the gear 16 a of the front upper roller 12 and the gear 16 b of the front lower roller 13 mesh with each other.
  • the gear 16 c (i.e., a second gear) of the rear upper roller 14 and the gear 16 d (i.e., a first gear) of the rear lower roller 15 mesh with each other.
  • a transmission gear 16 e is provided between the gear 16 b of the front lower roller 13 and the gear 16 d of the rear lower roller 15 .
  • the transmission gear 16 e meshes with the gear 16 b of the front lower roller 13 and the gear 16 d of the rear lower roller 15 .
  • the transmission gear 16 e is linked with a feeding motor 18 via a reduction gear 16 f .
  • the feeding motor 18 is provided in the lower frame unit 8 . With such an arrangement, a driving force of the feeding motor 18 is transmitted to the gears 16 a , 16 b , 16 c and 16 d , and the front rollers 12 and 13 and the rear rollers 14 and 15 rotate so as to feed the medium 7 in the +Y direction or the ⁇ Y direction.
  • the feeding motor 18 and the gears 16 a , 16 b , 16 c , 16 d and 16 e constitute the feeding driving unit 17 shown by a dashed line in FIG. 3 .
  • a platen 19 is provided between the front rollers 12 and 13 and the rear rollers 14 and 15 in the feeding direction of the medium 7 (i.e., the Y direction).
  • the platen 19 has an elongated shape in the X direction.
  • a carriage shaft 21 (i.e., a shaft) is mounted to the upper frame unit 9 , and is disposed on an upper side (i.e., the +Z side) of the platen 19 .
  • An axial direction of the carriage shaft is parallel to the X direction.
  • the carriage unit 11 is mounted to the carriage shaft 21 so as to be movable in the X direction.
  • the print head 10 is mounted on the carriage unit 11 .
  • the print head 10 i.e., a head unit
  • the print head 10 has a head nose facing the platen 19 .
  • An ink ribbon cassette 51 ( FIG. 2 ) is detachably mounted to the upper frame unit 9 .
  • the ink ribbon cassette 51 stores an ink ribbon therein.
  • the ink ribbon is guided by a ribbon guide 52 ( FIG. 2 ) detachably mounted to the carriage unit 11 , and runs through between the head nose of the print head 10 and the platen 19 .
  • Structures of the print head 10 and the ink ribbon cassette 51 are known, and therefore detailed explanations thereof are omitted.
  • a belt body 28 , a driving pulley 29 and a driven pulley (not shown) are provided on the upper frame unit 9 for moving the carriage unit 11 in the X direction.
  • the belt body 28 is stretched around the driving pulley 29 and the driven pulley.
  • the belt body 28 is fixed to the carriage unit 11 .
  • the driving pulley 29 is rotated by a carriage driving motor 27 ( FIG. 2 ) mounted to the upper frame unit 9 .
  • a standby position is provided in a movable range of the carriage unit 11 .
  • the standby position is disposed outside the medium feeding path F in the X direction.
  • a wire protrudes from the head nose of the print head 10 , and impacts the platen 19 .
  • the medium 7 and the ink ribbon are interposed between the platen 19 and the wire, and therefore an ink of the ink ribbon is transferred to the medium 7 by impact applied by the wire.
  • a line image i.e., a one-dimensional image
  • Line images in the X direction are formed on the medium 7 while the medium 7 is fed in the Y direction by the front rollers 12 and 13 and the rear rollers 14 and 15 .
  • a two-dimensional image is formed on the medium 7 .
  • the upper frame unit 9 is rotatable about the rotation axis A extending in the X direction.
  • the upper frame unit 9 is rotatable between a closing position ( FIG. 2 ) and an upper position ( FIG. 4 ).
  • the closing position the upper frame unit 9 is seated on the lower frame unit 8 .
  • the opening position the upper frame unit 9 is rotated upward from the lower frame unit 8 .
  • the medium feeding path F is formed between the upper frame unit 9 and the lower frame unit 8 .
  • the medium feeding path F is opened.
  • a tilt lever 22 i.e., a rotation locking mechanism
  • a lock lever 23 i.e., a rotation holding member
  • ⁇ X side i.e., a right side in FIG. 4
  • FIG. 5A is a side view showing the upper frame unit 9 as seen from the +X side.
  • FIG. 5B is a side view showing the upper frame unit 9 as seen from the ⁇ X side.
  • the tilt lever 22 is rotatably mounted to an outer side of a side plate 91 of the upper frame unit 9 via a not shown bearing.
  • the tilt lever 22 is fixed to the carriage shaft 21 mounted to the upper frame unit 9 .
  • An end portion of the carriage shaft 21 in the +X direction is formed to have a D-shaped cross section (see FIG. 6 ).
  • the tilt lever 22 has an engaging hole having a D-shape so as to engage the end portion of the carriage shaft 21 . With such an arrangement, the tilt lever 22 rotates together with the carriage shaft 21 about a center axis B of the carriage shaft 21 .
  • the tilt lever 22 has groove portions 22 a , 22 b and 22 c that successively engage a boss 24 a (i.e., an engaging portion) of the lower frame unit 8 .
  • the boss 24 a is formed on the +X side of the lower frame unit 8 .
  • the tilt lever 22 guides a rotation of the upper frame unit 9 or locks the rotation of the upper frame unit 9 .
  • the tilt lever 22 When the tilt lever 22 is in a rotational position as shown by a solid line in FIG. 5A , the tilt lever 22 locks the upper frame unit 9 at the closing position with respect to the lower frame unit 8 as described later. When the tilt lever 22 is in a rotational position as shown by a dashed line in FIG. 5A , the tilt lever 22 releases locking of the upper frame unit 9 as described later.
  • the lock lever 23 is rotatably mounted to a side plate 92 of the upper frame unit 9 via a not shown bearing.
  • the lock lever 23 is fixed to the carriage shaft 21 .
  • An end portion of the carriage shaft 21 in the ⁇ X direction is formed to have a D-shaped cross section.
  • the lock lever 23 has an engaging hole having a D-shape so as to engage the end portion of the carriage shaft 21 . With such an arrangement, the lock lever 23 rotates together with the carriage shaft 21 about the center axis B of the carriage shaft 21 .
  • the lock lever 23 has an engaging groove 23 a that engages a boss 24 b (i.e., an engaging portion) of the lower frame unit 8 .
  • the boss 24 b is formed on the ⁇ X side of the lower frame unit 8 .
  • the engaging groove 23 a engages the boss 24 b to lock the upper frame unit 9 at the closing position with respect to the lower frame unit 8 .
  • the engaging groove 23 a disengages from the boss 24 b to release the locking of the upper frame unit 9 .
  • FIG. 6 is a schematic view showing the tilt lever 22 in a state where the upper frame unit 9 is in the closing position as seen from an inner side of the side plate 91 (i.e., as seen from the ⁇ X side).
  • the tilt lever 22 has the first groove portion 22 a (i.e., a first portion) that engages the boss 24 a of the lower frame unit 8 .
  • the first groove portion 22 a extends along a circular arc about the center axis B of the carriage shaft 21 .
  • the first groove portion 22 a of the tilt lever 22 engages the boss 24 a of the lower frame unit 8 .
  • an upward rotation of the upper frame unit 9 is prevented by engagement between the first groove portion 22 a of the tilt lever 22 and the boss 24 a . In other words, the upper frame unit 9 is locked at the closing position.
  • FIG. 7 is a schematic view showing the tilt lever 22 in a state where the tilt lever 22 is rotated clockwise by a predetermined angle (for example, 25 degrees) from the state shown in FIG. 6 .
  • the tilt lever 22 has the second groove portion 22 b (i.e., a second portion) extending from a terminal end of the first groove portion 22 a .
  • the second groove portion 22 b extends along a circular arc about the rotation axis A.
  • FIG. 8 is a schematic view showing the tilt lever 22 in a state where the upper frame unit 9 is rotated to the opening position.
  • a terminal end i.e., a lower end of the second groove portion 22 b reaches the boss 24 a.
  • FIG. 9 is a schematic view showing the tilt lever 22 in a state where the tilt lever 22 is rotated clockwise by a predetermined angle (for example, 5 degrees) from the state shown in FIG. 8 .
  • the tilt lever 22 has the third groove portion 22 c (i.e., a third portion) extending from the terminal end (i.e., the lower end) of the second groove portion 22 b .
  • the third groove portion 22 c extends along a circular arc about the center axis B of the carriage shaft 21 .
  • the third groove portion 22 c of the tilt lever 22 engages the boss 24 a of the lower frame unit 8 .
  • a downward rotation of the upper frame unit 9 is prevented by engagement between the third groove portion 22 c of the tilt lever 22 and the boss 24 a .
  • the upper frame unit 9 is locked at the opening position.
  • a clockwise direction of the tilt lever 22 in FIGS. 6 through 9 is referred to as a normal direction (i.e., a D1 direction).
  • a counterclockwise direction of the tilt lever 22 in FIGS. 6 through 9 is referred to as a reverse direction (i.e., a D2 direction).
  • the front upper roller 12 and the front lower roller 13 are both mounted to the lower frame unit 8 .
  • the rear upper roller 14 is mounted to the upper frame unit 9
  • the rear lower roller 15 is mounted to the lower frame unit 8 . Therefore, it is necessary to prevent the gear 16 c of the rear upper roller 14 and the gear 16 d of the rear lower roller 15 from hitting each other.
  • the configuration described below is provided for this purpose.
  • FIGS. 10 and 11 are an exploded perspective view and a perspective vie showing a mounting structure of the gear 16 c .
  • the gear 16 c of the rear upper roller 14 is supported so as to be movable in the X direction. This is because, by allowing the gear 16 c to move in the X direction, the gears 16 c and 16 d can be prevented from hitting each other when the upper frame unit 9 returns to the closing position.
  • a shaft 14 a (i.e., the rotation shaft) of the rear upper roller 14 has an end portion (i.e., a gear holding portion) which is formed to have a D-shaped cross section.
  • the gear 16 c has an engaging hole having a D-shape.
  • the engaging hole of the gear 16 c engages the end portion (having the D-shaped cross section) of the shaft 14 a so that the gear 16 c is slidable in the axial direction of the shaft 14 a .
  • the end portion (having the D-shaped cross section) of the shaft 14 a has a sufficient length covering a moving range of the gear 16 c in the X direction. With such a configuration, the gear 16 c is movable in the X direction along the shaft 14 a of the rear upper roller 14 , and rotates together with the rear upper roller 14 .
  • a coil spring 26 (i.e., a biasing unit) is provided so as to surround the shaft 14 a of the rear upper roller 14 .
  • the coil spring 26 is configured to bias the gear 16 c in the ⁇ X direction.
  • the coil spring 26 has a winding axis extending in the X direction. An end of the coil spring 26 contacts the shaft 14 a . The other end of the coil spring 26 contacts a shaft holding portion 9 a provided on the upper frame unit 9 .
  • the upper frame unit 9 has a stopper 9 b ( FIG. 11 ) that defines a limit of movement of the gear 16 c in the ⁇ X direction.
  • the stopper 9 b prevents the gear 16 c from dropping out of the shaft 14 a of the rear upper roller 14 .
  • a cam member 25 ( FIG. 4 ) is provided in the vicinity of the end of the carriage shaft 21 in the ⁇ X direction.
  • the cam member 25 i.e., a shift mechanism
  • the cam member 25 is configured to move the gear 16 c in the X direction in accordance with the rotation (i.e., the opening and closing) of the upper frame unit 9 .
  • FIG. 12 is a perspective view showing the cam member 25 .
  • the cam member 25 has a substantially cylindrical shape whose axial direction is parallel to the X direction.
  • the cam member 25 has an outer circumferential surface 25 a (which is substantially cylindrical) and a circular plate 25 b provided at an end of the outer circumferential surface 25 a in the +X direction.
  • An engaging hole 25 c is provided at a substantially center of the circular plate 25 b .
  • the engaging hole 25 c is D-shaped, and engages the end portion (having the D-shaped cross section) of the carriage shaft 21 .
  • the cam member 25 rotates together with the carriage shaft 21 about the center axis B of the carriage shaft 21 .
  • the cam member 25 rotates together with the carriage shaft 21 (i.e., also together with the tilt lever 22 ). Therefore, when the tilt lever 22 rotates in the normal direction (D1), the cam member 25 also rotates in the normal direction (D1). When the tilt lever 22 rotates in the reverse direction (D2), the cam member 25 also rotates in the reverse direction (D2).
  • the cam member 25 has a recess portion 25 e which is retracted inward in a radial direction from the outer circumferential surface 25 a , and a protruding portion 25 f that protrudes outward in the radial direction from the outer circumferential surface 25 a .
  • a cam surface 25 d is formed between the recess portion 25 e and the protruding portion 25 f .
  • the cam surface 25 d has an inclination such that, when the cam 25 rotates in the normal direction (D1), a position on the cam surface 25 d moves in the +X direction.
  • FIG. 13A is a front view showing the cam member 25 as seen from the +X side.
  • FIG. 13B is a schematic view showing a cam profile of the cam surface 25 d .
  • a rotation angle of the cam member 25 when the tilt lever 22 is in a position shown in FIG. 6 (when the upper frame unit 9 is locked at the closing position) is defined as 0 degree, i.e., a reference angle.
  • a line L is defined as connecting the center axis B and a lowermost point of the cam member 25 .
  • the cam surface 25 d extends from ⁇ 5 degrees to 25 degrees with respect to the line L.
  • FIG. 14A is a perspective view showing a relationship among the gear 16 c of the rear upper roller 14 , the gear 16 d of the rear lower roller 15 and the cam member 25 .
  • FIG. 14B is a plan view showing a contact portion between the cam member 25 and the gear 16 c and its surroundings as seen from above (i.e., from the +Z side).
  • the gear 16 d of the rear lower roller 15 is mounted to a shaft 15 a (i.e., the rotation shaft) of the rear lower roller 15 via a universal joint 15 b (i.e., a connecting member). This is to keep the gears 16 c and 16 d meshing with each other when a thick medium 7 is introduced between the rear upper roller 14 and the rear lower roller 15 (i.e., when a gap between the rear rollers 14 and 15 increases).
  • FIGS. 14A and 14B show state where the upper frame unit 9 is locked at the closing position.
  • the rotation angle of the cam member 25 is 0 degree (i.e., the reference angle) as shown in FIGS. 13A and 13B .
  • the gear 16 c is in the recess portion 25 e of the cam member 25 , and faces the cam surface 25 d .
  • the gear 16 c contacts the stopper 9 b , but does not contact the cam surface 25 d as shown by circles A and B in FIGS. 14A and 14B .
  • FIG. 15A is a perspective view showing a state where the cam member 25 rotates in the normal direction (D1) from the state shown in FIG. 14A .
  • FIG. 15B is a plan view showing the contact portion between the cam member 25 and the gear 16 c and its surroundings as seen from above (i.e., from the +Z side).
  • the cam member 25 rotates by 2 degrees in the normal direction (D1) from the reference angle
  • the cam surface 25 d of the cam member 25 contacts the gear 16 c as shown by circles C and D in FIGS. 15A and 15B .
  • FIG. 16A is a perspective view showing a state where the cam member 25 further rotates in the normal direction (D1).
  • FIG. 16B is a plan view showing the contact portion between the cam member 25 and the gear 16 c and its surroundings as seen from above (i.e., from the +Z side).
  • FIG. 16C is a front view showing the contact portion between the cam member 25 and the gear 16 c and its surroundings as seen from front (i.e., from the +Y side).
  • the cam member 25 rotates. During this rotation of the cam member 25 , the contact portion between the cam member 25 and the gear 16 c moves from a terminal end of the cam surface 25 d to a flat surface of the protruding portion 25 f ( FIG. 13 ), and therefore a position of the gear 16 c does not change. Accordingly, the gear 16 is held at a position displaced from the gear 16 d in the +X direction.
  • the tilt lever 22 is not operated (rotated), and therefore the rotational position of the cam member 25 about the center axis B does not change. Accordingly, the gear 16 c is held at the position displaced from the gear 16 d in the +X direction.
  • the user inserts the medium 7 such as a printing sheet through the medium insertion opening 6 along the stage 5 .
  • the feeding motor 18 starts rotating.
  • a rotation of the feeding motor 18 is transferred to the gears 16 a , 16 b , 16 c and 16 d shown in FIGS. 3 and 4 , and the front rollers 12 and 13 and the rear rollers 14 and 15 start rotating.
  • the front rollers 12 and 13 and the rear rollers 14 and 15 feed the medium 7 in the ⁇ Y direction (i.e., rearward).
  • the carriage driving motor 27 starts rotating, and moves the carriage unit 11 ( FIG. 4 ) in the X direction. While the carriage unit 11 moves in the X direction, the wire protrudes from the head nose of the print head 10 and impacts the platen 19 . The ink ribbon is transferred to the medium 7 by impact. In this way, a line image (i.e., a one-dimensional image) in the X direction is formed on the medium 7 .
  • the front rollers 12 and 13 and the rear rollers 14 and 15 feed the medium 7 in the Y direction while the print head 10 forms the line images in the X direction. As a result, a two-dimensional image is formed on the medium 7 .
  • the carriage unit 11 moves to the standby position. Then, the front rollers 12 and 13 and the rear rollers 14 and 15 feed the medium 7 in the +Y direction, and eject the medium 7 from the medium insertion opening 6 . With this, the printing operation on the medium 7 is completed.
  • a jam of the medium 7 may occur. If such a jam occurs, the user first detaches the upper cover 1 ( FIG. 1 ) from the image forming apparatus 100 . When the upper cover 1 is detached, the tilt lever 22 is exposed, and it becomes possible to rotate (operate) the tilt lever 22 .
  • the user rotates the tilt lever 22 in the normal direction (D1) about the center axis B of the carriage shaft 21 by pushing the tilt lever 22 in the ⁇ Y direction (rearward).
  • the first groove portion 22 a (having a circular arc shape about the center axis B) of the tilt lever 22 moves along the boss 24 a of the lower frame unit 8 , and then the second groove portion 22 b of the tilt lever 22 engages the boss 24 a.
  • the lock lever 23 ( FIG. 5B ) rotates about the center axis B of the carriage shaft 21 in conjunction with the rotation of the tilt lever 22 .
  • the engaging groove 23 a of the lock lever 23 disengages from the boss 24 b substantially at the same time as when the first groove portion 22 a of the tilt lever 22 disengages from the boss 24 a .
  • the locking of the upper frame unit 9 at the closing position is released.
  • the tilt lever 22 When the tilt lever 22 is rotated in the normal direction (D1) about the center axis B by 5 degrees, the third groove portion 22 c of the tilt lever 22 engages the boss 24 a of the lower frame unit 8 . Therefore, the rotation of the upper frame unit 9 is locked, and the upper frame unit 9 is held at the opening position. In this state, the tilt lever 22 functions as a stay for supporting the upper frame unit 9 at the opening position.
  • the user rotates the tilt lever 22 in the reverse direction (D2) about the center axis B of the carriage shaft 21 from the state shown in FIG. 9 .
  • the third groove portion 22 c of the tilt lever 22 disengages from the boss 24 a of the lower frame unit 8
  • the second groove portion 22 b of the tilt lever 22 engages the boss 24 a of the lower frame unit 8 . Therefore, the locking of the upper frame unit 9 at the opening position is released.
  • the user rotates the upper frame unit 9 downward about the rotation axis A.
  • the second groove portion 22 b of the tilt lever 22 moves along the boss 24 a of the lower frame unit 8 .
  • the user rotates the tilt lever 22 in the reverse direction (D2).
  • the tilt lever 22 rotates in the reverse direction (D2)
  • the first groove portion 22 a of the tilt lever 22 engages the boss 24 a of the lower frame unit 8 .
  • the lock lever 23 rotates about the center axis B of the carriage shaft 21 in conjunction with the tilt lever 22 .
  • the engaging groove 23 a of the lock lever 23 engages the boss 24 b of the lower frame unit 8 substantially at the same time as when the first groove portion 22 a of the tilt lever 22 engages the boss 24 a . Therefore, the upper frame unit 9 is locked at the closing position.
  • the cam member 25 When the tilt lever 22 rotates in the reverse direction (D2), the cam member 25 also rotates in the reverse direction (D2) about the center axis B. When the cam member 25 rotates in the reverse direction (D2) about the center axis B, the contact portion between the cam surface 25 d and the gear 16 c moves in the ⁇ X direction, and therefore the gear 16 c moves in the ⁇ X direction by the biasing force of the coil spring 26 .
  • the above described operation is also performed when the upper frame unit 9 is opened and closed for replacing (i.e., detaching and attaching) the ink ribbon cassette.
  • the cam member 25 i.e., the shift mechanism
  • the gear 16 c holds the gear 16 c at a position (i.e., a retracted position) where the gear 16 c does not mesh with the gear 16 d . Therefore, the gears 16 c and 16 d are prevented from hitting each other. As a result, the gears 16 c and 16 d are prevented from being damaged.
  • the cam member 25 moves the gear 16 c to the retracted position in conjunction with an operation of the tilt lever 22 to release the locking of the upper frame unit 9 . Therefore, it is not necessary for the user to separately perform an operation to move the gear 16 c to the retracted position.
  • the cam member 25 moves the gear 16 c to a meshing position where the gear 16 c meshes with the gear 16 d , in conjunction with an operation of the tilt lever 22 to lock the upper frame unit 9 at the closing position. Therefore, the printing operation can be started immediately after the upper frame unit 9 returns to the closing position.
  • the cam member 25 moves the gear 16 c in the axial direction (i.e., the X direction), and therefore switching of the meshing between the gears 16 c and 16 d can be performed with a relatively simple configuration.
  • the tilt lever 22 is rotatably mounted to the upper frame unit 9 and has groove portions 22 a , 22 b and 22 c that engage the boss 24 a of the lower frame unit 8 . Therefore, the rotation of the upper frame unit 9 can be controlled using the tilt lever 22 .
  • the tilt lever 22 functions as a stay for supporting the upper frame unit 9 at the opening position, and therefore it is not necessary to provide an exclusive supporting member for supporting the upper frame unit 9 at the opening position.
  • the cam member 25 is mounted to the carriage shaft 21 guiding the carriage unit 11 , and therefore a locking-and-releasing operation of the upper frame unit 9 using the tilt lever 22 and a moving operation of the gear 16 c using the cam member 25 can be performed in conjunction with each other.
  • the cam member 25 and the lock lever 23 described in the first embodiment are integrated.
  • An image forming apparatus of the second embodiment have the same configurations as those of the image forming apparatus of the first embodiment except the integration of the lock lever 23 and the cam member 25 .
  • FIG. 17 is a perspective view showing a main part of the image forming apparatus of the second embodiment. As shown in FIG. 17 , the lock lever 23 described in the first embodiment is not provided on the outer side of the side plate 92 of the upper frame unit 9 .
  • FIG. 18 is a perspective view showing the image forming apparatus in a state where the upper frame unit 9 is opened.
  • a combined cam member that also serves as a lock lever (referred to as a cam member 75 ) is provided in the upper frame unit 9 .
  • the cam member 75 is configured to function as the cam member 25 and the lock lever 23 described in the first embodiment.
  • FIG. 19 is a perspective view showing a shape of the cam member 75 .
  • FIG. 20A is a front view showing the cam member 75 .
  • FIG. 20B is a schematic view showing a cam profile of the cam member 75 .
  • the cam member 75 includes a cylindrical portion 75 A having a substantially cylindrical shape whose axial direction is parallel to the X direction, and a lock lever portion 75 B that protrudes outward (substantially in a radial direction) from the cylindrical portion 75 A.
  • the cylindrical portion 75 A has an outer circumferential surface 75 a which is substantially cylindrical, and a circular plate 75 b provided at an end of the outer circumferential surface 75 a in the +X direction.
  • An engaging hole 75 c is provided at a substantially center of the circular plate 75 b .
  • the engaging hole 75 c is D-shaped, and engages the end portion (having the D-shaped cross section) of the carriage shaft 21 .
  • the cam member 75 rotates together with the carriage shaft 21 about the center axis B of the carriage shaft 21 .
  • the lock lever portion 75 B (i.e., a lock portion) extends in the radial direction of the cam member 75 from the center axis B (i.e., a rotation axis of the cam member 75 ).
  • An engaging groove 75 g is formed on an end portion of the lock lever portion 75 B.
  • the engaging groove 75 g extends along a circular arc about the center axis B.
  • the engaging groove 75 g of the lock lever portion 75 B engages a boss 74 provided on the lower frame unit 8 shown in FIG. 18 when the upper frame unit 9 is in the closing position. That is, the engaging groove 75 g engages the boss 74 to lock the upper frame unit 9 in the closing position.
  • the cam member 75 has a recess portion 75 e which is retracted inward in a radial direction from the outer circumferential surface 75 a , and a protruding portion 75 f that protrudes outward in the radial direction from the outer circumferential surface 75 a .
  • a cam surface 75 d is formed between the recess portion 75 e and the protruding portion 75 f .
  • the recess portion 75 e , the protruding portion 75 f and the cam surface 75 d are respectively the same as the recess portion 25 e , the protruding portion 25 f and the cam surface 25 d described in the first embodiment.
  • the cam profile of the cam surface 75 d shown in FIG. 20B is the same as the cam profile ( FIG. 13B ) of the cam surface 25 d described in the first embodiment. That is, when the cam member 75 rotates in the normal direction (D1) from the reference angle (0 degree) by 2 degrees, the cam surface 75 d of the cam member 75 contacts the gear 16 c . When the rotation angle of the cam member (from the reference angle) reaches 20 degrees, the gear 16 c pushed by the cam surface 75 d of the cam member 75 is released from meshing with the gear 16 d . When the rotation angle of the cam member 75 (from the reference angle) reaches 25 degrees, the meshing between the gears 16 c and 16 d is completely released. That is, the gears 16 c and 16 d are apart from each other.
  • FIG. 21A is a side view showing the upper frame unit 9 as seen from the +X side.
  • FIG. 21B is a side view showing the upper frame unit 9 as seen from the ⁇ X side.
  • the tilt lever 22 locks the upper frame unit 9 at the closing position.
  • the tilt lever 22 releases locking of the upper frame unit 9 .
  • the boss 74 of the second embodiment is located at a position shifted in the +Y direction and in the +Z direction with respect to the boss 24 b ( FIG. 5 ) of the first embodiment. This is because the lock lever portion 75 B of the second embodiment is provided on an inner side of the side plate 92 of the upper frame unit 9 . The boss 74 is located so that the lock lever portion 75 B (engageable with the boss 74 ) does not interfere with the gear 16 c.
  • FIG. 22A is a perspective view showing a relationship among the gear 16 c of the rear upper roller 14 , the gear 16 d of the rear lower roller 15 and the cam member 75 when the upper frame unit 9 is locked at the closing position.
  • FIG. 22B is a plan view showing a contact portion between the cam member 75 and the gear 16 c and its surroundings as seen from above (i.e., from the +Z side).
  • the rotation angle of the cam member 75 is 0 degree (i.e., the reference angle) as described with reference to FIGS. 20A and 20B .
  • the gear 16 c is in the recess portion 75 e of the cam member 75 , and faces the cam surface 75 d .
  • the gear 16 c does not contact the cam surface 75 d as shown by circles G and H in FIGS. 22A and 22B .
  • FIG. 23A is a perspective view showing a state where the cam member 75 rotates in the normal direction (D1) from the state shown in FIG. 22A .
  • FIG. 23B is a plan view showing the contact portion between the cam member 75 and the gear 16 c and its surroundings as seen from above (i.e., from the +Z side).
  • the cam member 75 rotates in the normal direction (D1) by 2 degrees from the reference angle
  • the cam surface 75 d of the cam member 75 contacts the gear 16 c as shown by circles I and J in FIGS. 23A and 23B .
  • FIG. 24A is a perspective view showing a state where the cam member 75 further rotates in the normal direction (D1).
  • FIG. 24B is a plan view showing the contact portion between the cam member 75 and the gear 16 c and its surroundings as seen from above (i.e., from the +Z side).
  • FIG. 24C is a front view showing the contact portion between the cam member 75 and the gear 16 c and its surroundings as seen from front (i.e., from the +Y side).
  • the cam member 75 rotates. During this rotation of the cam member 75 , the contact portion between the cam surface 75 d and the gear 16 c moves from a terminal end of the cam surface 75 d to a flat surface of the protruding portion 75 f ( FIG. 19 ), and therefore a position of the gear 16 c does not change. Accordingly, the gear 16 is held at a position displaced from the gear 16 d in the +X direction.
  • the tilt lever 22 is not operated (rotated), and therefore the rotational position of the cam member 75 does not change. Accordingly, the gear 16 c is held at the position displaced from the gear 16 d in the +X direction.
  • the gear 16 c of the upper frame unit 9 is kept displaced from the gear 16 d of the lower frame unit 8 in the +X direction.
  • the gears 16 c and 16 d are prevented from hitting each other.
  • the cam member 75 when the tilt lever 22 is rotated in the normal direction (D2), the cam member 75 also rotates in the reverse direction (D2).
  • the contact portion between the cam surface 75 d and the gear 16 c moves in the ⁇ X direction, and therefore the gear 16 c moves in the ⁇ X direction by the biasing force of the coil spring 26 .
  • the cam member 75 i.e., a shift mechanism
  • the gear 16 c holds the gear 16 c at a position (i.e., a retracted position) where the gear 16 c does not mesh with the gear 16 d . Therefore, the gears 16 c and 16 d are prevented from hitting each other. Accordingly, as in the first embodiment, the gears 16 c and 16 d are prevented from being damaged.
  • the cam member 75 has the lock lever portion 75 B. Therefore, the switching of the meshing of the gears 16 c and 16 d and the locking (releasing) of the upper frame unit 9 are performed using the same component (i.e., the cam member 75 ). As a result, manufacturing cost can be reduced.
  • the image forming apparatus is configured to feed the medium 7 (i.e., the printing medium) and print an image on the medium 7 using the print head 10 .
  • the present invention is not limited to such a configuration.
  • the present invention is applicable to an image forming apparatus configured to feed a reading medium such as a document and read an image of the reading medium using a reading head.
  • the upper frame unit 9 is locked at the closing position by the tilt lever and the lock lever 23 .
  • the image forming apparatus is not of a large size, it is also possible to lock the upper frame unit 9 at the closing position using the tilt lever 22 only (i.e., without using the lock lever 23 ).
  • the gear 16 c of the rear upper roller 14 is moved in the X direction so as to prevent the gears 16 c and 16 d from hitting each other.
  • the upper frame unit 9 is rotatably supported by the lower frame unit 8 .
  • the present invention is not limited to such a configuration.
  • the present invention is applicable to an image forming apparatus including a first unit and a second unit configured to be divisible (openable) at a medium feeding path provided therebetween.
  • the present invention is not limited to such a configuration.
  • the present invention is applicable to an image forming apparatus configured to prevent a gear of a first feeding member of a first unit and a gear of a second feeding member of a second unit from hitting each other.
  • cam profiles of the cam members 25 and 75 shown in FIGS. 13B and 20B are merely examples, but can be modified according to a specific configuration of the image forming apparatus.
  • the present invention is applicable to an image forming apparatus (for example, a printer, a copier, a facsimile machine and a multifunction peripheral) including a first unit and a second unit one of which is openable.
  • an image forming apparatus for example, a printer, a copier, a facsimile machine and a multifunction peripheral

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Handling Of Sheets (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US14/061,909 2012-10-26 2013-10-24 Image forming apparatus Active US8840109B2 (en)

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JP2012-236471 2012-10-26
JP2012236471A JP5732022B2 (ja) 2012-10-26 2012-10-26 画像形成装置

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JP3212186B2 (ja) * 1993-06-18 2001-09-25 東芝テック株式会社 用紙搬送装置
JPH09202489A (ja) * 1996-01-26 1997-08-05 Canon Inc シート材搬送装置及び画像形成装置
JP3760597B2 (ja) * 1997-10-02 2006-03-29 村田機械株式会社 自動原稿搬送装置の開閉カバー機構
KR20080103233A (ko) * 2007-05-23 2008-11-27 삼성전자주식회사 미싱노즐검지부를 구비하는 복합기
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JP5189125B2 (ja) * 2010-03-23 2013-04-24 ブラザー工業株式会社 シート搬送装置及び画像形成装置
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JPH0872344A (ja) 1994-09-06 1996-03-19 Oki Electric Ind Co Ltd 水平プリンタのフィードローラ駆動機構
US20060145416A1 (en) * 2005-01-05 2006-07-06 Giese Troy A Imaging apparatus with sheet transport system employing cam actuating system
US8028992B2 (en) * 2008-08-29 2011-10-04 Brother Kogyo Kabushiki Kaisha Recording sheet transporting apparatus and image forming apparatus
US20110262200A1 (en) * 2010-04-21 2011-10-27 Toshiba Tec Kabushiki Kaisha Sheet transport device for image forming apparatus
US20120248693A1 (en) * 2011-03-29 2012-10-04 Jarrett Clark Gayne Nip separator device for a roll assembly
US8360425B2 (en) * 2011-03-31 2013-01-29 Cal-Comp Precision (Singapore) Limited Depinching mechanism for paper jam removal in printer

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CN103786448B (zh) 2017-07-14
JP5732022B2 (ja) 2015-06-10
US20140117613A1 (en) 2014-05-01
JP2014084223A (ja) 2014-05-12

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